how-to revert cups update?

[bill walton]

I recently did a system update that included a cups update(s) for
USN-707-1.  

I have a USB printer attached: Star Micronics Thermal Printer, Model
TSP100.  It was working fine as-of 2.91.2009.

Now I get...

>From Printer configuration -> Print Test Page, I get a dialog that says:

There was an error during the CUPS operation:
'client-error-document-format-not-supported'.


>From /var/log/cups/error_log:

D [27/Feb/2009:14:23:30 -0600] Get-Printer-Attributes
ipp://localhost/printers/TSP113_(STR_T-001)
D [27/Feb/2009:14:23:30 -0600] cupsdProcessIPPRequest: 19 status_code=0
(successful-ok)
D [27/Feb/2009:14:23:34 -0600] cupsdReadClient: 20
POST /printers/TSP113_(STR_T-001) HTTP/1.1
D [27/Feb/2009:14:23:34 -0600] cupsdAuthorize: No authentication data
provided.
D [27/Feb/2009:14:23:34 -0600] Print-Job
ipp://localhost/printers/TSP113_(STR_T-001)
D [27/Feb/2009:14:23:34 -0600] Print-Job
client-error-document-format-not-supported: Unsupported format
'application/postscript'!
D [27/Feb/2009:14:23:34 -0600] cupsdProcessIPPRequest: 20
status_code=40a (client-error-document-format-not-supported)
D [2

I'd like to revert the cups upgrade to see if that is, indeed, the
source of the problem .  Or is there a better solution?

TIA,
Bill